div {
  box-sizing: border-box;
}

body, html, div, p, h1, h2, h3, h4, h5 {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

:root {
  --site-width: 960px;

  --bgcolor-1: rgb(225,220,220);
  --bgcolor-2: rgb(250,250,250);
  --bgcolor-3: rgb(245,65,45);

  --header-height: 50px;

  --shadow-size: 8px;
  --shadow-color: rgba(0,0,0,0.35);
}